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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_MapRGBA</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Video"
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14 HREF="video.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_MapRGB"
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17 HREF="sdlmaprgb.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_GetRGB"
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20 HREF="sdlgetrgb.html"></HEAD
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21 ><BODY
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22 CLASS="REFENTRY"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 WIDTH="100%"
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32 BORDER="0"
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="sdlmaprgb.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 ></TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="sdlgetrgb.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLMAPRGBA"
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71 >SDL_MapRGBA</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN1230"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_MapRGBA -- Map a RGBA color value to a pixel format.</DIV
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81 ><DIV
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82 CLASS="REFSYNOPSISDIV"
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83 ><A
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84 NAME="AEN1233"
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85 ></A
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86 ><H2
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87 >Synopsis</H2
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88 ><DIV
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89 CLASS="FUNCSYNOPSIS"
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90 ><A
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91 NAME="AEN1234"
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92 ></A
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93 ><P
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94 ></P
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95 ><PRE
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96 CLASS="FUNCSYNOPSISINFO"
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97 >#include "SDL.h"</PRE
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98 ><P
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99 ><CODE
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100 ><CODE
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101 CLASS="FUNCDEF"
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102 >Uint32 <B
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103 CLASS="FSFUNC"
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104 >SDL_MapRGBA</B
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105 ></CODE
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106 >(SDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b, Uint8 a);</CODE
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107 ></P
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108 ><P
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109 ></P
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110 ></DIV
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111 ></DIV
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112 ><DIV
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113 CLASS="REFSECT1"
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114 ><A
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115 NAME="AEN1240"
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116 ></A
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117 ><H2
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118 >Description</H2
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119 ><P
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120 >Maps the RGBA color value to the specified pixel format and returns the
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121 pixel value as a 32-bit int.</P
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122 ><P
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123 >If the format has a palette (8-bit) the index of the closest matching
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124 color in the palette will be returned.</P
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125 ><P
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126 >If the specified pixel format has no alpha component the alpha value
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127 will be ignored (as it will be in formats with a palette).</P
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128 ></DIV
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129 ><DIV
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130 CLASS="REFSECT1"
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131 ><A
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132 NAME="AEN1245"
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133 ></A
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134 ><H2
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135 >Return Value</H2
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136 ><P
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137 >A pixel value best approximating the given RGBA color value for a given
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138 pixel format. If the pixel format bpp (color depth) is less than 32-bpp
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139 then the unused upper bits of the return value can safely be ignored
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140 (e.g., with a 16-bpp format the return value can be assigned to a
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141 <SPAN
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142 CLASS="TYPE"
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143 >Uint16</SPAN
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144 >, and similarly a <SPAN
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145 CLASS="TYPE"
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146 >Uint8</SPAN
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147 > for an 8-bpp
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148 format).</P
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149 ></DIV
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150 ><DIV
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151 CLASS="REFSECT1"
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152 ><A
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153 NAME="AEN1250"
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154 ></A
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155 ><H2
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156 >See Also</H2
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157 ><P
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158 ><A
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159 HREF="sdlgetrgb.html"
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160 >SDL_GetRGB</A
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161 >,
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162 <A
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163 HREF="sdlgetrgba.html"
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164 >SDL_GetRGBA</A
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165 >,
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166 <A
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167 HREF="sdlmaprgb.html"
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168 >SDL_MapRGB</A
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169 >,
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170 <A
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171 HREF="sdlpixelformat.html"
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172 >SDL_PixelFormat</A
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173 ></P
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174 ></DIV
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175 ><DIV
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176 CLASS="NAVFOOTER"
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177 ><HR
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178 ALIGN="LEFT"
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179 WIDTH="100%"><TABLE
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180 WIDTH="100%"
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181 BORDER="0"
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182 CELLPADDING="0"
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183 CELLSPACING="0"
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184 ><TR
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185 ><TD
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186 WIDTH="33%"
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187 ALIGN="left"
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188 VALIGN="top"
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189 ><A
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190 HREF="sdlmaprgb.html"
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191 >Prev</A
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192 ></TD
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193 ><TD
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194 WIDTH="34%"
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195 ALIGN="center"
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196 VALIGN="top"
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197 ><A
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198 HREF="index.html"
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199 >Home</A
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200 ></TD
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201 ><TD
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202 WIDTH="33%"
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203 ALIGN="right"
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204 VALIGN="top"
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205 ><A
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206 HREF="sdlgetrgb.html"
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207 >Next</A
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208 ></TD
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209 ></TR
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210 ><TR
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211 ><TD
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212 WIDTH="33%"
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213 ALIGN="left"
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214 VALIGN="top"
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215 >SDL_MapRGB</TD
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216 ><TD
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217 WIDTH="34%"
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218 ALIGN="center"
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219 VALIGN="top"
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220 ><A
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221 HREF="video.html"
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222 >Up</A
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223 ></TD
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224 ><TD
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225 WIDTH="33%"
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226 ALIGN="right"
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227 VALIGN="top"
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228 >SDL_GetRGB</TD
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229 ></TR
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230 ></TABLE
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231 ></DIV
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232 ></BODY
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233 ></HTML
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234 > |
